Do you have a water softener in your house? Have you run out of sidewalk salt on an icy / snowy day? If you do have a water softener and you run out of sidewalk salt, then use the water softener salt pellets on your sidewalk, driveway and outdoor steps to melt through the snow and ice.
Be sure to sweep the water softener salt away after it has melted the snow and ice. If you leave it on the bare sidewalk, it could eat away at your sidewalk.